Attachment for metal-working machines.



No. sas'al. Patented Nov. 12, mol.

' ms. PEnnoTT.

ATTACHMENT FDR METAL WORKING MACHINES.

j (Applcation'led Feb. 7, 1901.)

' (No Model.)

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Ill?) Tm: nomma Pmszqco. vrenrrxmrnn., wAsmNc'roN n c ,UNrTED STATES PATENT OFFICE.

RICHARD B. PERROTT, OF WILMINGTON, DELAWARE, ASSIGNOR OF ONE- TI-IIRD TO SAMUEL E. HART, OF WILMINGTON, DELAWARE.

ATTACHMENT FOR METAL-WORKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 686,681, dated November 12, 1901.

' Applicant ned rea-myd, 1901. j serial No. 46,424. et@ modem at Wilmington, in the county of Newcastle and State of Delaware, have invented'new and useful Improvements in Attachments for Metal-Working Machines, of which the following isa speciiication.

This invention relates to an attachment for metal-working machines, it being primarily intended as an efficient adjunct in various kinds of metal Work, in which ield the attachment can be clamped in the usual toolpost or' clamped on the usual tool-block or otherwise secured to the tool post or block or carriage of an ordinary engine-lathe or screwcutting machine or similar device, it being understood, of course, that the attachment is capable of employment with equal facility upon materials other than metal, and hence in this respect I do not wish to restrictA the invention.

The improved attachment in the present instance is arranged for producing screwthreads and involves in its construction a carrier adapted to be suitably secured to the tool post or carriage of a metal-working machine, a swinging tool-supporting member on the carrier, and adjusting means to maintain said swinging member, and consequently the cuttin g-tool, of V form, in a desired position, and these several elementsmay bearranged in any suitable manner. The swinging member-may be actuated in such manner as to move the tool toward and from the work, the

adjusting means serving to hold the swing! ing member, and consequently the cuttingtool, in the working position thereof, and the peculiar advantages accompanying the improvements will be set forth in the accompanying description, While the novel features will be covered in the claims.

I have shown in the drawings one simple and meritorious adaptation of the device, but it is to be understood that the invention is not limited to the particular location or disposition of the several parts, for these points may be modified within the scope of the accompanying claims.

In the drawings, Figure -1 is a plan view of a portion of a metal-working machine with.

f thev improved attachment applied thereto.

Fig. 2 is a sectional side elevation ofthe same. Fig. 3 is a sectional side elevation of the attachmentl dismounted. Fig. 4: is a rear elevation of said attachment.

Referring to Figs. 1 and 2,lthe numerals 13 and 14 designate the usual live and dead cen- `-ters between which the work 15 is held, the

work in the present instance consisting of a shaft or bar upon which V-shaped threads are to be cut.

The attachment includes in its organization a carrier for a swinging tool-supporting member, and said carrier is denoted in a general way by A, and it is shown as consisting in the present instance of a body member 16, upon which the swinging member j ust alluded to is directly mounted, and a shank 17, the latter in this case being conveniently clamped in the tool-post 18, the tool-block of which is slidable, as is customary, on the carriage, which is also slidable, as is usual, on the bed of the lathe. (N ot shown.) In the arrangement shown the body-piece 16 has at one end the cheeks or flanges 1 9 to receive the shank, the parts being rigidly united by means of rivets or equivalent fastening devices, or the shankv may be integrally a part of the bodypiece. 4 The swinging member which supports the tool, of V form, is denoted by 20, and it is pivoted at 2l to the carrier A, the' movement of the part 20, which movement is produced by the handle 30 or otherwise, toward and from the work being in a plane angular with respect to the axis of rotation of the wo'rk,'the 'amount 'of such angularity being arranged to accord with the angle formed by one side of the screw-thread being produced with the said axis of rotation. In the present case this angle will be' one of .sixty degrees, the said screw-thread produced being an ordinary V-thread of sixty degrees, the amount of the said movement on the part of the swinging member regulating the amount ofchip taken off and the swinging member being rigidly held in its adjusted position during the cutting operation and drawn away from the work while the carriage is returning to repeat the cutting operation. The swinging member has on its body portion 16 the longitudinal hub 22, bored the entire length to receive IOO the shank 23, which shank has at one end the tool-receiving head 24, the shank being also bored for a purpose that will hereinafter appear. The head 24 has a hole to receive the cutting-tool 25, the fit beinga free one, so that the tool can be easily removed, and this hole opens into the bore of the shank 23. The shank 23 receives at its end opposite that having the head 24 the nut 26, by which to firmly hold the shank and its head, and hence the tool, in place and against rotary movement during the cutting operation, the nut being adapted to bind against the hub 22. It will be seen that both points of the tool are V- shaped or edged, and in this case it is evident that one point can be used for roughing out or removing most of the material to be removed and that then by loosening the nut 26 the head 24, together with the tool, can be rotated, so as to present the unused or sharper end of the tool to the work for the purpose of finishing the same, the nut 26 being then tightened to secure the tool and the head in their new position. In order that the tool and head may be rotated to the extent of one hundred and eighty degrees, so that the end of the tool may follow in the track of the other end, stoppins (not shown) may be conveniently provided to limit or control this movementof the head 24 to that amount. The tool is secured in place in the head 24 by the screw 27, tted in the shank 23, the inner end of the screw being adapted to engage the tool. By turning this screw backward the tool can be removed to shift the same or for any other purpose, and said screw is conveniently tapped into the bore which receives it. As shown in Fig. 1, the attachment is so connected with the tool-block and tool-post as to be presented at an angular position with respect to the work, and therefore the swinging part 20 has a movement in a plane angular to the axis of rotation of the work.

The swinging member 2O has secured in some suitable manner to one of its side faces or made integrally a part of it the bracket 2S, having the hub 29, into which the longitudinally-bored actuating handle or lever 30 is threaded, the handle serving to move the swinging member to carry the tool toward or from the work. The hub 29 has secured to one side thereof the gib or plate 31, the free end of which is contiguous to the carrier or its body portion 16, the office of said gib being to prevent transverse oscillation of the swinging member. The handle 30 receives the longitudinal screw 32, threaded therein for a part of its length, the outer end of the screw having a milled or roughened head, by which it may be readily turned in its seat.

The inner' end of this screw is adapted to fit against the squared face 33 of the body portion 16 when the tool 25 is in its working position. The body portion 16 receives the adjusting -screw 34, the head of which is adapted to engage against the inner squared face of the hub 29, which, it will be understood, is in elect a part of the swinging member 20.

To show how this device may be used, the lathe or machine to which it is attached in the proper position, as heretofore mentioned, being supposed to be in the act of rotating the work, bar, or shaft 15 to be threaded, the point of the tool 25 is swung, by means of the lever 30, into contact with it. The regulating-screw 32 is then turned until its point abuts against the adjacent face or edge 33 of the carrier or body portion 16, the stop-screw 34 having been turned down into the same face or edge in order to be out of the way. The carriage or rest of the lathe, and with it the tool-block, with the device attached to it, is then caused to travel back and forth longitudinally on the lathe-bed by the action of the lead-screw of the lathe or its equivalent in the usual manner at the desired rate of speed and to the desired distance longitudinally. Now in order to remove the irst chip or cutting from the work, the tool having been swung clear of it, the regulating-screw 32 is withdrawn to the necessary extent and at the proper time the tool is swung in against the work, taking olf the desired chip or cutting by being held against the work, but being prevented by the contact of the regulating-screw 32 with the face 33 from taking olf more material than is necessary or advisable at each longitudinal passage of the tool. At the end of each cut the tool is swung out of engagement with the work and is returned to its starting-point, and the operation is repeated a number of times, the operator each time withdrawing the screw 32 the necessary amount and the tool taking a depth of cnt accordingly until the screw-thread has been IOO formed upon the work to the desired depth.

Vhen this has been accomplished and with all the parts of the device in the position of the finishing operation, the stop or duplicating screw 34 is withdrawn or unscrewed until its upper face abuts against the adjacent face of the hub or part 29, and remaining in this position it thus forms a limiting stop or gage, by means of which other pieces or bolts or shafts can be threaded, so as to be duplicates of the first one and of each other. It is evident that in the above-described operation and before the work has been threaded to its exact size the sharper and less-used end of the tool can be rotated into position, as already described, for taking the finishing cut or cuts, the duplicating stop 34 in each case gaging the finished depth.

In some cases the actuating-handle 30 can be arranged horizontally and the regulating and stop screws arranged in any convenient manner, and likewise the parts 22, 23, and 24 might be formed in one piece, in which case the rotating action will be absent. Divers other changes may also suggest themselves to mechanics skilled in this art.

The device constituting the subject-matter of this application permits of its being se- IIO Icured ina metal-working machine in such position that the plane in which the tool may be swung may form such an angle to the axis of rotation of the work that the cutting-tool may operate by removing from the work what is practically a single chip at a time, the work being done by one side only of the cuttingtool. The advantage of this will be obvious to experts in the art, as by the ordinary practice a V-thread tool commonly removes what maybe described as two chipsor cuttings at the same time. These chips sliding over the face of the tool interfere with each other and pile up thereon, thereby causing undue strain and friction, which serve to unnecessarily dull the edge of the cutting-tool and also roughen the work. So much so is this the case that upon some classes of material and some grades of steel it is a difcult matter to cut a smooth thread.

By the aid of my attachment I am enabled to secure highly-linished and accurate work in a comparatively small space of time and in an ordinary engine-lathe.

In some cases dierent types of tools could be substituted for that illustrated for the purpose of obtaining dierent kinds of work.

The swinging member 20, the bracket 28, and the lever 30 may in some cases be conveniently made in one part, and the machine may be otherwise modified within the scope of the following claims.

Having described the invention, what I claim isl. In an attachment of the class specified, a carrier, a swinging member on the carrier, and a tool-receiving member on the swinging member movable about an axis transverse to that about which said swinging member nieves.

2. In an attachment of the class specified, a carrier, a swinging member on the carrier and a tool-receiving member on said swinging member movable about an axis transverse to that about which said swinging member moves, provided with a tool having a plurality of cutting edges.

3. In an attachment of the class specied, a carrier, a swinging tool-carrying member on the carrier, the axis of said swinging member being situated above the cutting edgev of the tool and two unalined screws for controlling the position of said swinging toolcarry ing member.

4. In an attachment of the class specified, a carrier, Aa swinging member on the carrier, two unalined screws one connected with the carrier and the other connected with the swinging member, and tool-receiving means on said swinging member.

5. In an attachment of the class specified, a carrier, a swinging member on the carrier, a/tubular handle connected to said swinging member, a screw threaded in the bore of the handle and adapted to engage the carrier, and the tool-receiving means on the swinging member.

6. In an attachment of the class specified, a carrier, a swinging member on the carrier, a tubular handle connected to said swinging member, a screw passing entirely through the bore of said handle one end being adapted to engage the carrier, and a second screw on the carrier.

7. In an attachment of the class specified, a carrier adapted to be secured to the tool-post or tool-block or like part of a metal-working machine, a swinging member on the carrier adapted to support a tool, a bracket part on the swinging member having a hub and a handle iitted in said hub, and a gib secured to the hub, the face end thereof being in proximity to the carrier.

8. In an attachment of the class specified, a carrier, a swinging member on the carrier and adapted to receive a tool, and two screws, one threaded into the carrier and the other into the swinging member and adapted to engage the respective parts.

9. In an attachment of the class specified, a carrier having an attaching-shank, a swinging member on the carrier, a rotary tool-receiving member on the swinging member, a handle connected with said swinging member, and two unalined screws controlling the position of said swinging member.

10. In an attachment of the class specified,

'a carrier adapted to be secured to the toolpost or tool-block or like part of a metal-working machine, a swinging member, having a hub, a headed member the shank of which fits in the bore of the hub, and the head having a hole to` receive a tool, means for engaging the shank to hold the headed member in place, and means to secure the tool in a rigid position.

11. In an attachment of the class specified, a carrier adapted to be secured to the toolpost or tool-block or like part of a metal-working machine, a swinging member, having a hub, a headed member the shank of which fits in the bore of said hub and the head having a hole t-o receive a tool, said shank being bored, a nut on one end of the shank to hold the headed member in place, and a screw tapped into the bore of the shank and serving to engage and hold the tool in place.

l2. In an attachment of the class specied, a carrier adapted to be secured to the ordinary slide-rest of a lathe, a tool-receiving member, a pivot to attach the tool-receiving member to the carrier, said pivot being located above the cutting edge of the tool when the attachment is in its working position in the lathe, a handle for swinging said tool-receiving member,a setscrew to secure the tool in its seat, and two stop-screws arranged to limit the approach of the tool toward the work.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesess.

RICHARD B. PERROTT. Witnesses:

CHARLES G. GUYER, A. B. RoBERsoN.

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